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HEMATOLOGY EXAM with complete solutions

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Hematology

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Hematology

Blood collected in EDTA undergoes which of the following changes if kept at room temperature for 6-24 hours? a. Increased hematocrit and MCV To remove fresh blood from a lab coat you would: c. Apply a 3% hydrogen peroxide solution then rinse thoroughly with water Which of the follow...

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hematology exam with complete solutions

Instelling Hematology
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HEMATOLOGY EXAM with complete
solutions

Blood collected in EDTA undergoes which of the following changes if kept at
room temperature for 6-24 hours? - ANSWER- a. Increased hematocrit and MCV

To remove fresh blood from a lab coat you would: - ANSWER- c. Apply a 3%
hydrogen peroxide solution then rinse thoroughly with water

Which of the following achromatic objectives would be an oil immersion
objective: - ANSWER- c. N.A. 1.25

A blood smear from an infant was examined and it was discovered that there
were 20 nucleated erythrocytes for each 100 leukocytes counted. The observed
WBC count as 3.6 x 109/L. What is the corrected (true) leukocyte count? -
ANSWER- b. 3.00 x 109/L

The diluent used for counting platelets by the Unopette method is: - ANSWER- c.
1% ammonium oxalate

The principle of counting the cells using anoptical cell counter is: - ANSWER- c.
based on the scattering of light by cells

When a red blood cell count is performed on an electrical particle counter, the
counter usually - ANSWER- b. includes white blood cells

Cells are counted on the Coulter Counter as they pass through a path between
two electrodes by creating a - ANSWER- c. voltage decrease

You are performing a white blood cell count on a known leukemic patient. His
WBC count usually runs approximately 200 x 109/L. In order to count
approximately 40 cells in each of the four "W" squares, which of the following
combinations of pipette and dilution would you choose? - ANSWER- d. RBC
pipette, blood to 0.2

, Coincidence refers to: - ANSWER- d. The simultaneous passage of more than one
cell through the aperture

The light source on optical cell counters usually is a: - ANSWER- c. Laser beam

The reason for allowing the dilution made in a platelet unopette to sit for 10
minutes before plating is: - ANSWER- c. to lyse red blood cells

The protein that is involved in the transport of iron in the plasma is: - ANSWER- c.
transferrin

The largest quantity of body iron is found in the form of: - ANSWER- e.
hemoglobin

In order for hemoglobin to bind properly with oxygen, the iron must have the
following valence: - ANSWER- b. +2

The globin component of hemoglobin F - ANSWER- d. is composed of 2 alpha
and 2 gamma chains

Methemoglobin contains a: - ANSWER- a. ferric form of iron

In hemoglobin S disease, there is a substitution of: - ANSWER- a. valine for
glutamic acid

What is the function of the enzyme methemoglobin reductase in a red cell? -
ANSWER- a. to keep iron in the ferrous state

Hemoglobinopathies such as HbS and C have abnormalities occurring in their: -
ANSWER- b. beta chains of globin

According to the laboratory procedure manual at General Hospital, hematocrits
are to be spun at 10,000 PRM for 4 minutes. A new employee centrifuged the
hematocrits for only 2 minutes at 5,000 RPM. The hematocrit value may be: -
ANSWER- b. falsely increased

The stain used to visualize migration patterns in hemoglobin electrophoresis is: -
ANSWER- e. Ponceau S

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